Process for making cores for manufacturing tire-shoes.



R. M. HIN MAN. PROOESS FOR MAKING cons ron MANUFACTURING TIRE SHOES.

. APPLICATION FILED 00130, 1911. V 1,037,250, Patented Sept. 3, 1912.

COLUMBIA PLANDGRAPH CO. WASHINGTON, B- Cr-.

UNITED STATES PATENT OFFICE.

ROBERT M. HINMAN, OF AKRON, OHIO, ASSIGNOR OF ONE-HALF T0 FRANK NOLTE, OF AKRON, OHIO.

PROCESS FOR MAKING CORES FOR MANUFACTURINGTIRE-SHOES.

Specification of Letters Patent.

Original application filed December 1, 1909, Serial No. 530,876. Divided and this application filed October Serial No. 657,529.

To all whom it may concern.

Be it known that I, ROBERT M. HINMAN, a citizen of the United States, residingat Alnon, in the county of Summit and State of Ohio, have invented new and useful Im-' provements in Processes for Making Cores for Manufacturing Tire-Shoes, of which the following is a specification.

This invention relates to improvements in processes or methods for manufacturing cores or mandrels such as are commonly used in the making of outer tire-shoes of plurality of segments by hack-saws or other suitable means so as to divide the cores into suitable portions to permit the removal of one segment after another from the inner open portion of the tire-shoe after vulcani-,

zation. These cuts, however, which sever the annular body of the cores into a plurality of segment-shaped members remove so much of the material of the core that when the segment-shaped members are again assembled. the resulting product does not form a true circle and hence, it becomes imperative in such cases to secure fillerblocks or plates on the ends of one or both of the abutting faces of the segment-shaped members to compensate for the loss incident to the cuts made in severing the cores into segments. Further it is necessary that these filler-blocks or plates be secured rigidly to the ends of the segment-shaped members and as this requires drilling and tapping holes or providing dowel-pins for riveting the same in position the loss of time and which the molten metal passes from one segment-shaped compartment of the mold into another to unite the entire core-body into an integral member, the inserted plates being usually united with the corebody by the casting operatiombut being cold they do not fuse therewith. After the corehas been cast it is placed in a suitable machine and the outside finished to impart to the exterior surface thereof the desired conformation which it is sought to impart to the interior of the tire-shoes to be formed thereon after which the core-body is broken into segment-shaped members at the points where the interposed plates are positioned. In practice, the interposed plates will customarily attach to one or the other of the abutting ends of the segment-shaped members but, if for any reason they do not attach themselves to the segment-shaped members, they may be afterward united therewith by suitable hold-fast devices.

From the foregoing-it will be seen that the interposition of the plates in the molds and having apertures therein to permit the molten metal to pass through the same and to unite the metal of coadjacent segmentshaped members accomplishes the function of uniting the entire core into a unitary mass during the finishing of the exterior thereof and also provides frangible joint-s between contiguous segment-shaped members of the core, which will permit the small connecting portions forming the frangible joints to be easily broken to separate the core into a plurality of independent segment-shaped members adapted to be afterward united or abutted end to end to form an annular core-body and to be held in position through the medium of auxiliary means, the resulting product being an annularly-formed core-body comprising a plurality of segment-shaped members capable of being detached when necessary and reassembled for reuse.

With the foregoing and other objects in view, the invention consists in the novel method for constructing a core, said method constituting the invention to be hereinafter more specifically described in connection with the accompanying drawings, reference to which is therein made. a

In the drawings in which similar reference numerals indicate like parts in the different members detachedshowing the interposed filler-plate secured thereto; and, Fig. at, is a longitudinal Central sectional view enlarged of thecore shown in Fig. 1.

In constructing a mold for ring-cores in accordance with this invention an ordinary mold is employed, which is preferably pro vided with a cavityof suitable conformatlon to form an annular core 1 having a body-portion of approximately the shape which it is desired to impart to the in- 1 teriorof the 'finishedtire-shoe, and further provided with an inwardly-extending flange 2 having on opposite faces thereof annular grooves 3, with the inner and outer walls of said groove 3 inclined as shown in -the drawings. there; is interposed in the cavity of the mold a plurality of'plates 4 extending across the cavity and arranged obliquely to the radii thereof and preferably arranged as shown in Fig. 1. These plates are provided with apertures 5 through which the molten metal which forms the core may pass from one segment-shaped cavity of the mold to an Before the casting operation.

adjoining cavity to thereby unite all portions of'the core into an integral mass when the metal 0001s., These plates are generally made larger than the cavity in the mold in either the cope or drag thereby securely anchoring the plates in the same to provide against their being unintentionally displaced by the molten metal during the operation. mandrels they are usually formed with casting cavities 6 therein which is accomplished by the employment of ordinarysand-cores, the

In casting these ring-cores or.

sand-cores in each segment-shaped cavity or mold stopping short of the ends of the cavities to provide solid walls of metal at the ends of the segment-shaped members'in the finished product; After the ring-core has been cast, the device is placed in a suitable .machine such as a boring mill and the exterior thereof turned to the exact shape which it is desired to impart to the in- V terior of the tire-shoe to be built thereon.

Previous to the turning or 'finishing'ofthei exterior of the core. the surplus portions of the plate 4 which extend beyond the outline; of the core-body are cut or broken away, usually by hand. During this latter operation the abutting ends of the segment-shaped;

portion being firmly united by the metal which extends through the aperturese and the interposed plates f prevent them from being displaced. After the exterior'of the core has been turned to impart the desiredf cross section configuration thereto, the various segments are broken apart, in doing,

It will be noted that the apertures 5, as

shown in Fig. 1: are frusto-conically-formed so that the metal extending 1n these apertures ls' smaller 1n diameter at one side of the platethan at the other and thesegmentshaped members are customarily separated or broken "apart on the linewhere the thickne'ss of the metal extending from the aperture is smallest'and weakest, thus constituting a. frangible joint between adjacent and contiguous segment-shaped portions of I the preformed annular core-body.

In use after the segment-shaped members have been broken apart to make them independent of each otherthey are reassembled for use and held in position through I the medium of two, rings 8 clamped over the sides of the flanges of conti uous segments for -maintaining them in annularformation. These rings are preferably clamped together through the medium 'of bolts 9 which extend through the flanges of the segment-shaped members and serve to maintain them and the rings in proper relation with respectto each other thereby providing easy remov able means for'permitting the collapsing of the core by the successive withdrawal of the various segments thereof through the inner opening in the body of the tire-shoe which is made thereon.

1. A method of manufacturing cores'for forming the outer shoes of double-tube pneumatic tires, consisting in inserting in an annular mold-cavity a dividing medium provided with means for permitting asmall portion of the metalin'one portion of the cavity to unite with the metal in a coadjacent cavity, thereby providing a frangiblejoint between coadjacent segments of a finished core, causing said dividing medium to adhere to the end of one of said segments,

and subsequently breaking said sections apart to provide a collapsible core capable of being reassembled into an annular body. 2. That improvement in methods for manufacturing cores for forming the outer shoes of double-tube pneumatic t1res,'wh1ch consists in incorporating in an annular mold-cavity a plurality of apertured dividing mediums each provided with means 1 for permitting a small connecting portion of the'metal in coadjacent portions of the mold-cavity to unite through said dividing medium thereby providing a frangible joint between said coadjacent portions of the iin- In testimony whereof I have hereunto set lshed core,secur1ng sald dividing mediums my hand in presence of two suscribing Wit- 10 to the ends of said core portions and subsenesses.

quently breakin said sections apart at said 1 5 frangible joints and along one face of each ROBERT HINMAN' of said dividing mediums to permit the re- Witnesses: assembling of said core-forming portions C. E. HUMPHREY,

into an annular body. A. L. MGCLINTOQK.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. G. 

